Note: Your applications are not affected during the upgrade, but you can neither manage the cluster by using the Web interface, nor use Docker client to connect to the cluster access port for about 2 minutes.
The Agent of Container Service, which is installed on each server in the cluster, receives commands issued by the Container Service control system.
New functions are regularly added to Container Service. If you need the latest functions, upgrade the Agent of the cluster.
Log on to the Container Service console.
Click Clusters in the left-side navigation pane.
On the Cluster List page, click More at the right of the cluster that you want to upgrade the Agent and then select Upgrade Agent from the list.
Click OK in the displayed dialog box.